Sellier & Bellot has just recently (finally) come out with their own load meant specifically for self-defense use in a revolver such as the Judge or Governor. I presume it has only been out for a few months, if that, and it does not seem widespread at all anywhere online. This is a relatively late entrant into the whole 410 revolver ammo market and S&B may have up until now been relying on sales of their preexisting 00-buck 410 loads (not revolver-specific) before seeking to get fancy with this duplex offering.
There is a 2.50" and 3.00" version, with the 2.50" having one 000-buck and 15 BB pellets, and the 3.00" having two 000-buck and 15 BB pellets. The index number for the 2.50" load is V236702U while the 3.00" is V236902U